Light guide plate and backlight module
View Patent ↗A light guide plate includes a plate-shaped transparent body and a plurality of stripe-shaped planar structures. The plate-shaped transparent body is bent to form a top portion, a bottom portion, and a curved portion connected between the top portion and the bottom portion, and the top portion and the bottom portion are substantially parallel to each other and define a gap therebetween. The stripe-shaped planar structures are connected with each other on an outer surface of the curved portion.
1. A light guide plate capable of transmitting a light beam, comprising:
a plate-shaped transparent body bent to form a top portion, a bottom portion, and a curved portion connected between the top portion and the bottom portion, wherein the top portion and the bottom portion are substantially parallel to each other and define a gap therebetween; and
a plurality of stripe-shaped planar structures connected with each other on an outer surface of the curved portion, wherein the stripe-shaped planar structures form a plurality of angles with a central plane of the curved portion, and the values of the angles are gradually decreased from the central plane to a periphery of the outer surface of the curved portion.
2. The light guide plate of claim 1 , wherein the curved portion is divided by the central plane into a first half of the curved portion and a second half of the curved portion, and a number of the stripe-shaped planar structures in the first half of the curved portion is different to a number of the stripe-shaped planar structures in the second half of the curved portion.
3. The light guide plate of claim 1 , wherein an included angle θr between an r th stripe-shaped planar structure counted from the central plane and the central plane satisfies the following equation:
θ r= 90°*[ n −( r th −1)]/ n
, where n denotes the number of the stripe-shaped planar structures between the central plane and the periphery of the outer surface of the curved portion.
4. The light guide plate of claim 1 , further comprising:
a plurality of first micro structures on a first side surface of the top portion opposite the bottom portion for guiding a light beam out of the plate-shaped transparent body through the first side surface; and
a plurality of second micro structures on a second side surface of the bottom portion opposite the top portion for guiding a light beam out of the plate-shaped transparent body through the second side surface.
5. The light guide plate of claim 4 , wherein each of the first micro structures and the second micro structures comprises a groove or a dot.
6. The light guide plate of claim 1 , further comprising:
a plurality of third micro structures on a third side surface of the top portion facing towards the bottom portion for guiding a light beam out of the plate-shaped transparent body through the third side surface; and
a plurality of fourth micro structures on a fourth side surface of the bottom portion facing towards the top portion for guiding a light beam out of the plate-shaped transparent body through the fourth side surface.
7. The light guide plate of claim 6 , wherein each of the third micro structures and the fourth micro structures comprises a groove or a dot.
8. The light guide plate of claim 1 , wherein one end of the bottom portion is adjacent to at least one light source and a thickness of the bottom portion is gradually decreased and then increased in a direction away from the curved portion.
9. The light guide plate of claim 1 , wherein one end of the bottom portion is adjacent to at least one light source and a thickness of the bottom portion is gradually decreased or increased in a direction away from the curved portion.
10. The light guide plate of claim 1 , wherein one end of the bottom portion is adjacent to at least one light source and a thickness of the top portion is gradually decreased in a direction away from the curved portion.
11. A backlight module, comprising:
a plate-shaped transparent body bent to form a top portion, a bottom portion, and a curved portion connected between the top portion and the bottom portion, wherein the top portion and the bottom portion are substantially parallel to each other and define a gap therebetween;
a plurality of stripe-shaped planar structures connected with each other on an outer surface of the curved portion;
a light source disposed adjacent to one side of the plate-shaped transparent body for emitting a light beam;
a reflective cover disposed adjacent to the outer surface of the curved portion to reflect the light beam leaving the curved portion back to the plate-shaped transparent body; and
a double-sided reflective sheet disposed in the gap formed between the top portion and the bottom portion.
12. The backlight module of claim 11 , wherein the stripe-shaped planar structures form a plurality of angles with a central plane of the curved portion, and the values of the angles are gradually decreased from the central plane to a periphery of the outer surface of the curved portion.
13. The backlight module of claim 12 , wherein the curved portion is divided by the central plane into a first half of the curved portion and a second half of the curved portion, and the number of the stripe-shaped planar structures in the first half of the curved portion is different to the number of the stripe-shaped planar structures in the second half of the curved portion.
14. The backlight module of claim 12 , wherein an included angle θr between an r th stripe-shaped planar structure counted from the central plane and the central plane satisfies the following equation:
θ r= 90°*[ n −( r th −1)]/ n
, where n denotes the number of the stripe-shaped planar structures between the central plane and the periphery of the outer surface of the curved portion.
15. The backlight module of claim 11 , further comprising:
a plurality of first micro structures on a first side surface of the top portion opposite the double-sided reflective sheet for guiding a light beam out of the plate-shaped transparent body through the first side surface; and
a plurality of second micro structures on a second side surface of the bottom portion opposite the double-sided reflective sheet for guiding a light beam out of the plate-shaped transparent body through the second side surface.
16. The backlight module of claim 11 , further comprising:
a plurality of third micro structures on a third side surface of the top portion facing towards the double-sided reflective sheet for guiding a light beam out of the plate-shaped transparent body through the third side surface; and
a plurality of fourth micro structures on a fourth side surface of the bottom portion facing towards the double-sided reflective sheet for guiding a light beam out of the plate-shaped transparent body through the fourth side surface.
17. The backlight module of claim 11 , wherein the light source has a light-emitting surface and the light-emitting surface overlaps an end surface of the top portion or an end surface of the bottom portion.
18. The backlight module of claim 11 , wherein part areas of the double-sided reflective sheet are coated with a light-absorbing material.